EFFECT OF RADIATION ON DYNAMIC PROPERTIES OF HIGH POLYMERS. Progress Report for July 1, 1959 to June 30, 1960
Technical Report
·
OSTI ID:4160265
>The radiation effects on isotopic polypropylene and polyethylene were investigated at 25, 75, and 125 deg C at dosages up to 5 x 10/sup 8/ rep. Crosslinking efficiency, mechanical loss, and dynamic elastic storage modulus were investigated for irradiated polyethylene at 77 to 450 deg K. Measurements of sound velocity and propagation in polyethylene, polystyrene, and other materials were made in the 1.3 x 10/sup -3/ to 10/sup 7/ cps range at 20 deg C. Proton magnetic resonance measurements of poly(pentene-1), poly(3-methyl butene-1), and poly(4-methyl pentene-1) were made at 77 to 400 deg K. NMR second moments were calculated and experimentally determined for poly(methyl methacrylate), poly(methacrylic acid), poly(sodium methacrylate), and poly(alpha methyl styrene) at 77 to 435 deg K. N(MR studies on polyethylene and other paraffinic materials at 77 to 395 deg K revealed that considerable motion takes place at 25 to 70 deg K below the melting points of the materials. The effect of H/sub 2/O and D/sub 2/ O on the NMR spectra of 6-10 and 10-10 nylons greatly increased the segmental mobility. The effect of N-methylation increased chain mobility. Proton magnetic resonance measurements were made on sodium poly Beryllium undengoes two nuclear reactions with fast neutrons. The effects on the material become more important at high doses and operating temperatures. A discussion of these effects is presented with brief reference to those of the normal atomic displacements. (J.R.D.)
- Research Organization:
- Pennsylvania State Univ., University Park
- NSA Number:
- NSA-14-022116
- OSTI ID:
- 4160265
- Report Number(s):
- TID-6197
- Country of Publication:
- United States
- Language:
- English
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